Expression of K homology domain containing protein (KOC) in pancreatic cytology with corresponding histology

Adam D. Toll, Agnieszka K. Witkiewicz, Marluce Bibbo

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Objective To evaluate if immunocytochemical expression of K homology domain containing protein overexpresssed in cancer (KOC) in biliary brushings and fine needle aspiration improves the diagnostic capability of cytology for intraductal papillary mucinous neoplasm (IPMN) and pancreatic ductal adenocarcinoma (PDA). Study Design Fourteen PDAs, 15 IPMNs and 7 chronic pancreatitis cases were obtained. The cytology smears and surgical specimens were stained with antibody to KOC (1:500). The intensity (scale 0-3+) and percentage of cells staining were evaluated in pathologic lesions, and diffuse (> 75% of cells) staining of 3+ intensity was considered positive. Results There was 100% specificity for diagnosing PDA. The sensitivity was greater in histology (79%) than cytology (71%). All chronic pancreatitis and IPMN cases, including IPMN with high grade dysplasia, were negative. Benign epithelium adjacent to PDA or IPMN was also negative. Conclusion This study demonstrated that PDA can be differentiated from IPMN and benign ductal epithelium using KOC expression. This could be useful in cytologic cases where atypical features preclude a definitive diagnosis of malignancy.

Original languageEnglish (US)
Pages (from-to)123-129
Number of pages7
JournalActa Cytologica
Issue number2
StatePublished - 2009


  • Aspiration biopsy
  • Fine-needle
  • K homology domain containing protein
  • Pancreatic cancer

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Histology


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